ST AN2406 APPLICATION NOTE

AN2406

Application note

TS4962IQ class D audio amplifier

Evaluation board user guidelines

Features

■ TS4962IQ low voltage class D differential audio power amplifier with standby mode

■ Operating range from Vcc=2.4V to 5.5V

■ 2.2W output power @ Vcc=5V, THD=1%, F=1kHz, with 4Ω load

■ 1.4W output power @ Vcc=5V, THD=1%, F=1kHz, with 8Ω load

■ Ultra low power consumption in standby mode (10nA)

■ 63dB PSRR @ 217Hz in grounded mode (Av=2V/V)

■ Low pop & click

■ Fast startup time: 5ms

■ Module gain set at 2V/V

Description

This mono class D demoboard is designed for the TS4962IQ class D audio amplifier. The
TS4962IQ device, in a DFN pac kage, is mounted on a t wo-la y er PCB with t wo po wer pl anes
acting as a heatsink.

Figure 1. shows the schematic diagram of the demoboard.

Figure 1. Schematic diagram of the mono class D demoboard

Vcc

Positive input

Negative Input

Cn1

Input

Cn4

1
2
3

Cn2

C1
100nF

1
2

GND

3

100nF
C2

Cn3

GND

R1

150k
R2

150k

Stdby

1

4

In­In+

3

-

+

300k

150k

150k

C3
1uF

Internal

Bias

Oscillator

GND

PWM

Vcc

Vcc

Output

H

Bridge

GND
7

GND

6

Out+

Out-

U1

5

8

TS4962DFN

Cn6

Gnd

Cn5

Positive Output
Negative Output

Speaker

April 2007 Rev 2 1/5

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AN2406

Figure 2. shows the top view of the demoboard PCB, with the markings showing the

connector placements.

Figure 2. Mono class D demoboard - top view

Caution: When you apply the pow er supply throug h Cn6, DO NO T in vert the polarity because it would

destroy the amplifier U1.

Table 1 lists the connectors on the demoboard, with a description for each, and their

configurations.

Table 1. Description of demoboard connectors and their configurations

Connectors Description

Cn1 Input signal connector (active input signal positive and negative)

Cn2 and Cn3

Connectors to modify input configuration (from capacitor-coupled = no jumper to

common mode feedback = short-circuit).
Cn5 Output signal connector (Vo+ and Vo-)
Cn4 Standby control connector (GND, Standby, VCC)
Cn6 Power connector (V

and GND). Power supply voltage from 2.4V to 5.5V.

CC

U1 Class D amplifier TS4962IQ

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AN2406

A list of the components mounted on the demoboard is given in Table 2.

Table 2. Component list for the mono class D demoboard

Designation Quantity Description

C1 1 100nF/10V X7R/0603 capacitor
C2 1 100nF/10V X7R/0603 capacitor

C3 1 1μF/10V, X5R/0603 capacitor
Cn1 1 3 pins header 2.54mm pitch
Cn2 1 2 pins header 2.54mm pitch
Cn3 1 2 pins header 2.54mm pitch
Cn4 1 3 pins header 2.54mm pitch
Cn5 1 2 pins header 2.54mm pitch
Cn6 1 2 pins header 2.54mm pitch

R1 1 150k, 1/16W/0603 1% resistor

R2 1 150k, 1/16W/0603 1% resistor

U1 1 TS4962IQ

Figure 3 and Figure 4 show the demoboard PCB layers.

Figure 3. PCB bottom layer Figure 4. PCB top layer

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Configuring the demoboard characteristics AN2406

Configuring the demoboard characteristics

Differential gain

The demoboard is set up with the differential gain AV set to 2V/V.
If necessary , the diff erential gain can be adapted b y modifying the v alues of resistors R1 and

R2, in accordance with the following relation:

where R1=R2 in kΩ.

Input configuration

On the demoboard, the Cn2 and Cn3 jumpers allow you to change the input configuration
between capacitor-coupled and common-mode feedback.

In the capacitor-coupled configuration, the -3dB cut-off frequency in Hz is:

with R in Ohms, C in Farads and C1=C2.
More information about component calculations is available in the TS4962 datasheet.

Revision history

Date Revision Changes

300kΩ

-----------------

A

v

1

R1

××π

or =

=

CR2

300kΩ

A

-----------------=

v

R2

1

CR2

××π

2211

28-Jul-2006 1 Initial release.

12-Apr-2007 2 Updated

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Table 2: Component list for the mono class D demoboard.

AN2406

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